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<head><meta charset="utf-8"><title>doc perf regression · t-compiler/performance · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/index.html">t-compiler/performance</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/doc.20perf.20regression.html">doc perf regression</a></h3>

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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/doc%20perf%20regression/near/233824246" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/doc.20perf.20regression.html#233824246">(Apr 09 2021 at 13:52)</a>:</h4>
<p>pretty big regression across the board - <a href="https://perf.rust-lang.org/compare.html?start=125505306744a0a5bb01d62337260a95d9ff8d57&amp;end=2e495d2e845cf27740e3665f718acfd3aa17253e&amp;stat=instructions%3Au">https://perf.rust-lang.org/compare.html?start=125505306744a0a5bb01d62337260a95d9ff8d57&amp;end=2e495d2e845cf27740e3665f718acfd3aa17253e&amp;stat=instructions%3Au</a> - unfortunately, in a rollup</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/doc%20perf%20regression/near/233824345" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/doc.20perf.20regression.html#233824345">(Apr 09 2021 at 13:53)</a>:</h4>
<p>looks like likely due to <a href="https://github.com/rust-lang/rust/pull/81764">https://github.com/rust-lang/rust/pull/81764</a>, cc <span class="user-mention" data-user-id="232545">@Joshua Nelson</span></p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/doc%20perf%20regression/near/233824381" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Joshua Nelson <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/doc.20perf.20regression.html#233824381">(Apr 09 2021 at 13:53)</a>:</h4>
<p>oh wow that is giant</p>



<a name="233824452"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/doc%20perf%20regression/near/233824452" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Joshua Nelson <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/doc.20perf.20regression.html#233824452">(Apr 09 2021 at 13:53)</a>:</h4>
<p>what is it doing <span aria-label="laughing" class="emoji emoji-1f606" role="img" title="laughing">:laughing:</span></p>



<a name="233824620"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/doc%20perf%20regression/near/233824620" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Joshua Nelson <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/doc.20perf.20regression.html#233824620">(Apr 09 2021 at 13:54)</a>:</h4>
<p>oh oops I marked the regex as <code>const</code> not <code>static</code></p>



<a name="233824647"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/doc%20perf%20regression/near/233824647" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Joshua Nelson <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/doc.20perf.20regression.html#233824647">(Apr 09 2021 at 13:54)</a>:</h4>
<p>I really wish we had that clippy lint as part of the copmiler</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/247081-t-compiler/performance/topic/doc%20perf%20regression/near/233825749" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Joshua Nelson <a href="https://rust-lang.github.io/zulip_archive/stream/247081-t-compiler/performance/topic/doc.20perf.20regression.html#233825749">(Apr 09 2021 at 14:01)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/pull/84034">https://github.com/rust-lang/rust/pull/84034</a></p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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